Wet and dry blended polymer pressure-sensitive adhesive, preparation method thereof, and pressure-sensitive adhesive tape

Abstract

The present application provides a wet and dry dual-purpose blended polymer pressure-sensitive adhesive, a preparation method thereof, and a pressure-sensitive adhesive tape, and relates to the field of pressure-sensitive adhesives. The wet and dry dual-purpose blended polymer pressure-sensitive adhesive is obtained by blending copolymers with different molecular weights; the first copolymer and the second copolymer are both obtained by polymerizing butyl acrylate or isooctyl acrylate, benzyl acrylate, and trimethylacryloyloxyethylammonium bistrifluoromethanesulfonyl imide. The preparation method thereof comprises: mixing the raw materials to obtain a first precursor solution, performing a polymerization reaction under an inert atmosphere, and then mixing the product with a poor solvent, precipitating to obtain a first copolymer; mixing the raw materials to obtain a second precursor solution, performing a second polymerization reaction under an inert atmosphere to obtain a second copolymer; and mixing the first copolymer and the second copolymer. The pressure-sensitive adhesive has high adhesion strength, good wettability to both hydrophilic and hydrophobic surfaces, high stability, and can be used in extreme water environments.

Description

Technical Field

[0001] The present application relates to the field of pressure-sensitive adhesives, and in particular to a dry and wet dual-purpose blended polymer pressure-sensitive adhesive, a preparation method thereof, and a pressure-sensitive adhesive tape. Background Art

[0002] In daily life and industrial production, adhesives are often needed to fix and connect parts and objects. Compared with traditional mechanical fixing methods, adhesive bonding has obvious advantages such as continuous stress distribution, low cost, light weight, and low operating temperature. Pressure-sensitive adhesive is a special viscoelastic material that is sensitive to pressure and has self-adhesive properties. When in use, the pressure-sensitive tape is covered on the surface of the adhesive substrate. The bonding effect can be adjusted by controlling the pressure applied to it without the aid of solvents, heating, and other external means. When the pressure-sensitive adhesive contacts the surface of the substrate, a dense bonding surface is formed. Due to the strong flow resistance generated during the separation process from the substrate, the bonding surface structure will not be damaged and can be used repeatedly. Thanks to its adjustable adhesion and ease of use, pressure-sensitive adhesives are widely used in many fields such as daily life, medical treatment, and aerospace applications.

[0003] According to the chemical composition, pressure-sensitive adhesives mainly include rubber-based, acrylate, silicone and polyurethane pressure-sensitive adhesives. Acrylate pressure-sensitive adhesives have the advantages of simple formula, good aging resistance, wide bonding range and low cost, and occupy an important position in the pressure-sensitive adhesive market. However, there are few pressure-sensitive adhesives that can be used in special and extreme environments. In view of the application requirements of pressure-sensitive adhesives in underwater environments, a dry and wet dual-purpose pressure-sensitive tape with good adhesion performance can be obtained by introducing catechol side groups and regulating the molecular weight and the degree of oxidation cross-linking of catechol. However, the synthesis steps of adhesives containing catechol groups are many, the alkali resistance is poor, and there are deficiencies in preparation and performance stability. Summary of the invention

[0004] The purpose of the present application is to provide a dry and wet dual-purpose blended polymer pressure-sensitive adhesive and a preparation method thereof and a pressure-sensitive adhesive tape to solve the above-mentioned problems.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] A wet and dry polymer blend pressure-sensitive adhesive obtained by blending a first copolymer and a second copolymer having different molecular weights;

[0007] The first copolymer and the second copolymer are both obtained by polymerizing butyl acrylate or isooctyl acrylate, benzyl acrylate and trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide.

[0008] Preferably, the molecular weight of the first copolymer is 2000-10000, and the molecular weight of the second copolymer is 40000-100000.

[0009] The present application also provides a method for preparing the dry and wet dual-purpose polymer blend pressure-sensitive adhesive, comprising:

[0010] Mixing butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide, a free radical initiator and a first organic solvent to obtain a first precursor solution;

[0011] The first precursor solution is subjected to a first polymerization reaction under an inert atmosphere, and then the product is mixed with a poor solvent and precipitated to obtain the first copolymer; the first polymerization reaction is a solution polymerization reaction;

[0012] Mix butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonyl imide and a free radical initiator or add a second organic solvent to obtain a second precursor solution;

[0013] The second precursor liquid is subjected to a second polymerization reaction under an inert atmosphere, and is mixed with a poor solvent and then precipitated, or the second copolymer is directly obtained; the second polymerization reaction is a bulk polymerization reaction or a solution polymerization reaction;

[0014] The first copolymer and the second copolymer are mixed to obtain the dry and wet dual-purpose blended polymer pressure-sensitive adhesive.

[0015] Preferably, the molar ratio of the butyl acrylate or isooctyl acrylate, the benzyl acrylate, and the trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide is (0.7-0.95): (0.15-0.025): (0.15-0.025), and the molar ratio of the three monomers of the first copolymer and the second copolymer is the same or different within the aforementioned range;

[0016] Preferably, the weight ratio of the first copolymer to the second copolymer is 1:4-4:1.

[0017] Preferably, the free radical initiator includes one or more of 2,2-azobisisobutyronitrile, benzoyl peroxide, Irgacure 184, Darocur 1173, 2,2-diethoxyacetophenone, and benzophenone;

[0018] Preferably, the first organic solvent and the second organic solvent each independently comprise tetrahydrofuran and / or N,N-dimethylformamide;

[0019] Preferably, the poor solvent includes one or more of n-hexane, petroleum ether and diethyl ether.

[0020] Preferably, the first polymerization reaction is carried out at 60-80°C for 2-10 hours; the second polymerization reaction is carried out at 60-80°C for 2-10 hours, or at room temperature under ultraviolet light for 1-5 hours.

[0021] The present application also provides a pressure-sensitive adhesive tape, comprising a substrate and the dry and wet dual-purpose blended polymer pressure-sensitive adhesive disposed on the surface of the substrate.

[0022] Preferably, the wet and dry dual-purpose polymer blend pressure-sensitive adhesive is dissolved in a third organic solvent before use and then coated on the surface of the substrate.

[0023] Preferably, the third organic solvent comprises one or more of tetrahydrofuran, dichloromethane, chloroform and acetone.

[0024] Preferably, the substrate comprises any one of PET film, PE film, PI film, PVC film, non-woven fabric, fabric, and metal foil.

[0025] Compared with the prior art, the beneficial effects of this application include:

[0026] The wet and dry dual-purpose co-polymer pressure-sensitive adhesive provided by the present application, the side chain includes a hydrophobic alkyl chain, a quaternary ammonium cation, and a benzene ring, which can form dipole-dipole, cation-π, π-π, ion-dipole, hydrogen bond, hydrophobic and other interactions with various substrate surfaces, and has intrinsic adhesion, and the hydrophobicity of the material is conducive to excluding the hydration layer; the pressure-sensitive adhesive is obtained by co-mixing two high and low molecular weight copolymers, the low molecular weight copolymer is conducive to improving the wettability to the substrate, and the high molecular weight copolymer is conducive to improving the cohesive strength of the material, and the combination of the two can effectively balance the initial adhesion, cohesion and adhesion, so that high adhesion strength can be generated on various substrate surfaces in dry and wet environments. The pressure-sensitive adhesive tape has good wettability to both hydrophilic and hydrophobic surfaces, and the high molecular weight polymer chain entanglement gives a certain cohesive force. The 90° peeling test result surface is adhered to various substrates such as glass and PET underwater, and the peeling strength is about 1200N / m. At the same time, the pressure-sensitive adhesive has acid-resistant, alkali-resistant, salt-resistant, and low-temperature-resistant stability, and can be used in extreme water environments.

[0027] The present application provides a method for preparing a dry and wet dual-purpose polymer blend pressure-sensitive adhesive, which has a simple process.

[0028] The pressure-sensitive adhesive tape provided in the present application comprises a substrate and the above-mentioned dual-purpose wet and dry polymer blended pressure-sensitive adhesive arranged on the surface of the substrate, and has the advantages of the above-mentioned dual-purpose wet and dry polymer blended pressure-sensitive adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0030] Figure 1 This is a photo of the 90° peeling test of the pressure-sensitive adhesive tape obtained in Example 1;

[0031] Figure 2 The peel strength curve of the pressure-sensitive adhesive tape obtained in Example 1 after being adhered underwater and in seawater. DETAILED DESCRIPTION

[0032] As used herein:

[0033] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0034] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0035] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0036] In these examples, parts and percentages are by mass unless otherwise indicated.

[0037] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0038] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0039] A wet and dry polymer blend pressure-sensitive adhesive obtained by blending a first copolymer and a second copolymer having different molecular weights;

[0040] The first copolymer and the second copolymer are both obtained by polymerizing butyl acrylate or isooctyl acrylate, benzyl acrylate and trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide.

[0041] It should be noted that the raw materials of the copolymer include three monomers: 1. butyl acrylate or isooctyl acrylate; 2. benzyl acrylate; 3. trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide.

[0042] Polymer molecular weight is a key factor in regulating the performance of pressure-sensitive adhesives. The effects of molecular weight on polymer properties include glass transition temperature (Tg), melting temperature (Tm), stiffness, strength, viscoelasticity, toughness and viscosity. Molecular weight improvement is conducive to the formation of polymer chain entanglement, which increases Tg and viscosity; for bulk adhesion, polymer chain entanglement is conducive to the interaction within the polymer to obtain high cohesion. Low molecular weight adhesives have better fluidity, so they have better wettability to the surface of the adhered substrate, but lack bulk strength. Therefore, pressure-sensitive adhesives need to take into account both the wettability to the substrate surface and the bulk strength to achieve strong adhesion. For pressure-sensitive adhesives that adhere underwater, it is also necessary to consider the function of excluding the interfacial hydration layer. The solution provided by the present application can well take into account the wettability to the substrate surface and the bulk strength as well as the function of excluding the interfacial hydration layer.

[0043] In an optional embodiment, the molecular weight of the first copolymer is 2000-10000, and the molecular weight of the second copolymer is 40000-100000.

[0044] Optionally, the molecular weight of the first copolymer may be 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000 or any value between 2000-10000, and the molecular weight of the second copolymer may be 40000, 50000, 60000, 70000, 80000, 90000, 100000 or any value between 40000-100000.

[0045] The present application also provides a method for preparing the dry and wet dual-purpose polymer blend pressure-sensitive adhesive, comprising:

[0046] Mixing butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide, a free radical initiator and a first organic solvent to obtain a first precursor solution;

[0047] The first precursor solution is subjected to a first polymerization reaction under an inert atmosphere, and then the product is mixed with a poor solvent and precipitated to obtain the first copolymer; the first polymerization reaction is a solution polymerization reaction;

[0048] Mix butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonyl imide and a free radical initiator or add a second organic solvent to obtain a second precursor solution;

[0049] The second precursor liquid is subjected to a second polymerization reaction under an inert atmosphere, and is mixed with a poor solvent and then precipitated, or the second copolymer is directly obtained; the second polymerization reaction is a bulk polymerization reaction or a solution polymerization reaction;

[0050] The first copolymer and the second copolymer are mixed to obtain the dry and wet dual-purpose blended polymer pressure-sensitive adhesive.

[0051] Relatively speaking, the first copolymer is a copolymer with a low molecular weight, and the second copolymer is a copolymer with a high molecular weight.

[0052] The second polymerization reaction is divided into two cases: 1. When no poor solvent is used for precipitation, it is a bulk polymerization reaction; 2. When a poor solvent is used for precipitation, it is a solution polymerization reaction.

[0053] In an optional embodiment, the molar ratio of the butyl acrylate or isooctyl acrylate, the benzyl acrylate, and the trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide is (0.7-0.95): (0.15-0.025): (0.15-0.025), and the molar ratio of the three monomers of the first copolymer and the second copolymer is the same or different within the aforementioned range;

[0054] Preferably, the weight ratio of the first copolymer to the second copolymer is 1:4-4:1.

[0055] Optionally, the molar ratio of the butyl acrylate or the isooctyl acrylate, the benzyl acrylate, and the trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide can be 0.7:0.15:0.15, 0.8:0.1:0.1, 0.95:0.025:0.025, or any value between (0.7-0.95):(0.15-0.025):(0.15-0.025). The weight ratio of the first copolymer to the second copolymer can be 1:4, 0.5:1, 1:1, 2:1, 3:1, 4:1, or any value between 1:4-4:1.

[0056] In an optional embodiment, the free radical initiator includes one or more of 2,2-azobisisobutyronitrile, benzoyl peroxide, Irgacure 184, Darocur 1173, 2,2-diethoxyacetophenone, and benzophenone;

[0057] In an optional embodiment, the first organic solvent and the second organic solvent each independently include tetrahydrofuran and / or N,N-dimethylformamide;

[0058] In an optional embodiment, the poor solvent includes one or more of n-hexane, petroleum ether and diethyl ether.

[0059] In an optional embodiment, the first polymerization reaction is carried out at 60-80°C for 2-10 hours; the second polymerization reaction is carried out at 60-80°C for 2-10 hours, or at room temperature under ultraviolet light for 1-5 hours.

[0060] The present application also provides a pressure-sensitive adhesive tape, comprising a substrate and the dry and wet dual-purpose blended polymer pressure-sensitive adhesive disposed on the surface of the substrate.

[0061] In an optional embodiment, the wet and dry dual-purpose blended polymer pressure-sensitive adhesive is dissolved in a third organic solvent before use and then coated on the surface of the substrate.

[0062] In an optional embodiment, the second organic solvent includes one or more of tetrahydrofuran, dichloromethane, chloroform and acetone.

[0063] In an optional embodiment, the substrate includes any one of a PET film, a PE film, a PI film, a PVC film, a non-woven fabric, a fabric, and a metal foil.

[0064] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0065] Example 1

[0066] This embodiment provides a dry and wet dual-purpose polymer blend pressure-sensitive adhesive, which is obtained by blending a first polymer with a high molecular weight and a second polymer with a low molecular weight.

[0067] The preparation method is as follows:

[0068] (1) dissolving monomer I butyl acrylate, monomer II benzyl acrylate, monomer III trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide and free radical initiator 2,2'-azobisisobutyronitrile in tetrahydrofuran at a molar ratio of 0.85:0.075:0.075:0.01, and mixing well;

[0069] (2) The precursor solution prepared in step (1) is placed under nitrogen protection and subjected to polymerization reaction at 70° C.;

[0070] (3) After the reaction is completed, the polymer obtained in step (2) is precipitated in petroleum ether, washed several times, and dried;

[0071] (4) mixing monomer I, monomer II, monomer III and free radical initiator 2,2'-azobisisobutyronitrile in a molar ratio of 0.85:0.075:0.075:0.01;

[0072] (5) The precursor solution prepared in step (4) was deoxygenated by passing nitrogen for 30 minutes, and then placed in a sealed container for polymerization reaction at 70° C.;

[0073] (6) After the reaction is completed, the high molecular weight copolymer obtained in step (5) and the low molecular weight copolymer obtained in step (3) are mixed in a weight ratio of 1:1 to obtain a dry and wet dual-use polymer blend pressure-sensitive adhesive.

[0074] This embodiment also provides a pressure-sensitive adhesive tape, and the preparation method thereof is as follows:

[0075] The pressure-sensitive adhesive obtained in step (6) is dissolved in tetrahydrofuran, coated on a PTE film, and the organic solvent is volatilized to obtain a pressure-sensitive adhesive tape. The pressure-sensitive adhesive has super hydrophobicity, and a static water contact angle greater than 160°.

[0076] Figure 1The following is a photo of the 90° peeling test of the obtained pressure-sensitive tape. The peeling strength after adhering to glass underwater is about 1200N / m. The pressure-sensitive tape can be reused in an underwater environment without significant changes in peeling strength. The pressure-sensitive tape has excellent water resistance. After being bonded to the substrate and immersed in water for one month, the peeling strength does not change significantly. At the same time, the pressure-sensitive tape can be used in a seawater environment, and the peeling strength is also maintained at about 1200N / m. Figure 2 This is a peel strength curve of the pressure-sensitive tape after adhesion underwater and in seawater.

[0077] Example 2

[0078] This embodiment provides a dry and wet dual-purpose polymer blend pressure-sensitive adhesive, which is obtained by blending a first polymer with a high molecular weight and a second polymer with a low molecular weight.

[0079] The preparation method is as follows:

[0080] (1) dissolving monomer I isooctyl acrylate, monomer II benzyl acrylate, monomer III trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide and thermal initiator in N,N-dimethylformamide at a molar ratio of 0.8:0.1:0.1:0.005, and mixing thoroughly;

[0081] (2) The precursor solution prepared in step (1) is placed under nitrogen protection and subjected to polymerization reaction at 65° C.;

[0082] (3) After the reaction is completed, the polymer obtained in step (2) is precipitated in n-hexane, washed several times, and dried;

[0083] (4) Mixing monomer I, monomer II, monomer III and free radical Irgacure 184 in a molar ratio of 0.8:0.1:0.1:0.01;

[0084] (5) The precursor solution prepared in step (4) was deoxygenated by passing nitrogen for 30 minutes, and then placed in a sealed container for polymerization reaction under ultraviolet light;

[0085] (6) After the reaction is completed, the high molecular weight copolymer obtained in step (5) and the low molecular weight copolymer obtained in step (3) are mixed in a weight ratio of 1:1 to obtain a dry and wet dual-purpose polymer blend pressure-sensitive adhesive.

[0086] This embodiment also provides a pressure-sensitive adhesive tape, and the preparation method thereof is as follows:

[0087] The pressure-sensitive adhesive obtained in step (6) is dissolved in tetrahydrofuran and then coated on a PTE film. The organic solvent is evaporated to obtain a pressure-sensitive adhesive tape.

[0088] Example 3

[0089] This embodiment provides a dry and wet dual-purpose polymer blend pressure-sensitive adhesive, which is obtained by blending a first polymer with a high molecular weight and a second polymer with a low molecular weight.

[0090] The preparation method is as follows:

[0091] (1) dissolving monomer I butyl acrylate, monomer II benzyl acrylate, monomer III trimethylacryloyloxyethyl ammonium bistrifluoromethanesulfonimide and thermal initiator in tetrahydrofuran at a ratio of 0.85:0.05:0.1:0.01, and mixing thoroughly;

[0092] (2) The precursor solution prepared in step (1) is placed under nitrogen protection and subjected to polymerization reaction at 70° C.;

[0093] (3) After the reaction is completed, the polymer obtained in step (2) is precipitated in diethyl ether, washed several times, and dried;

[0094] (4) dissolving monomer I, monomer II, monomer III and thermal initiator in N,N-dimethylformamide at a molar ratio of 0.9:0.5:0.5:0.005;

[0095] (5) The precursor solution prepared in step (4) is passed through nitrogen protection and subjected to polymerization reaction at 70° C.;

[0096] (6) After the reaction is completed, the high molecular weight copolymer obtained in step (5) and the low molecular weight copolymer obtained in step (3) are mixed in a weight ratio of 1:1, and after the solvent is evaporated, a dry and wet blend polymer pressure-sensitive adhesive is obtained.

[0097] This embodiment also provides a pressure-sensitive adhesive tape, and the preparation method thereof is as follows:

[0098] The pressure-sensitive adhesive obtained in step (6) is dissolved in acetone and then coated on a PTE film. The organic solvent is evaporated to obtain a pressure-sensitive adhesive tape.

[0099] Comparative Example 1

[0100] The high molecular weight second copolymer was dissolved in tetrahydrofuran and coated on a PET film. The organic solvent was evaporated to obtain a pressure-sensitive tape. A 90° peeling test was performed, and the peeling strength after adhering to glass underwater was measured to be about 40 N / m.

[0101] Comparative Example 2

[0102] The low molecular weight first copolymer was dissolved in tetrahydrofuran and coated on a PET film. The organic solvent was evaporated to obtain a pressure-sensitive tape. A 90° peeling test was performed, and the peeling strength after adhering to glass underwater was measured to be about 50 N / m.

[0103] Comparative Example 3

[0104] Butyl acrylate and free radical initiator Irgacure184 were mixed uniformly in a molar ratio of 1:0.01, nitrogen was introduced for deoxygenation for 30 minutes, and the mixture was placed in a sealed container for polymerization under ultraviolet light. After the reaction, the obtained polymer was dissolved in tetrahydrofuran and coated on a PET film. The organic solvent was evaporated to obtain a polybutyl acrylate pressure-sensitive adhesive. A 90° peeling test was performed, and the peeling strength after adhering to glass underwater and in seawater was only about 310N / m. There was residual adhesive on the surface of the base material, and the pressure-sensitive adhesive tape was difficult to reuse. The polybutyl acrylate pressure-sensitive adhesive lacked bulk strength and did not have long-term stability.

[0105] Comparative Example 4

[0106] Benzyl acrylate and free radical initiator Irgacure184 were uniformly mixed in a molar ratio of 1:0.01, nitrogen was introduced for deoxygenation for 30 minutes, and then the mixture was placed in a sealed container for polymerization under ultraviolet light. After the reaction, the obtained polymer was dissolved in tetrahydrofuran and coated on a PET film. The organic solvent was evaporated to obtain a polybenzyl acrylate tape, which had no adhesion to glass in an underwater environment.

[0107] Comparative Example 5

[0108] Trimethylacryloxyethylammonium bistrifluoromethanesulfonyl imide and free radical initiator Irgacure184 were uniformly mixed in a molar ratio of 1:0.01, nitrogen was introduced for deoxygenation for 30 minutes, and then the mixture was placed in a sealed container for polymerization reaction under ultraviolet light. After the reaction, the obtained polymer was dissolved in tetrahydrofuran and coated on a PET film. The organic solvent was volatilized, and the obtained polytrimethylacryloxyethylammonium bistrifluoromethanesulfonyl imide was separated from the PET film, and no polymer tape could be obtained. The polytrimethylacryloxyethylammonium bistrifluoromethanesulfonyl imide had high hardness and had no adhesion to glass in an underwater environment.

[0109] Comparative Example 6

[0110] Benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonyl imide and free radical initiator Irgacure184 are uniformly mixed in a molar ratio of 0.5:0.5:0.01, placed in a sealed container and subjected to polymerization reaction under ultraviolet light. After the reaction is completed, the obtained polymer is dissolved in tetrahydrofuran and coated on a PET film. The organic solvent is evaporated to obtain a copolymer tape. The copolymer has high hardness and has no adhesion to glass in an underwater environment.

[0111] Comparative Example 7

[0112] Butyl acrylate, benzyl acrylate or trimethylacryloyloxyethylammonium bistrifluoromethanesulfonyl imide and free radical initiator Irgacure184 are uniformly mixed in a molar ratio of 0.5:0.5:0.1, placed in a sealed container for polymerization reaction under ultraviolet light irradiation, and after the reaction is completed, the obtained polymer is dissolved in tetrahydrofuran and coated on a PET film, and the organic solvent is evaporated to obtain a copolymer tape, which has no adhesion to glass in an underwater environment.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0114] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A wet and dry polymer blend pressure-sensitive adhesive, characterized in that: Obtained by blending a first copolymer and a second copolymer having different molecular weights; The first copolymer and the second copolymer are both obtained by polymerizing butyl acrylate or isooctyl acrylate, benzyl acrylate and trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide; The molar ratio of the butyl acrylate or the isooctyl acrylate, the benzyl acrylate, and the trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide is (0.7-0.95): (0.15-0.025): (0.15-0.025), and the molar ratio of the three monomers of the first copolymer and the second copolymer is the same or different within the aforementioned range; The molecular weight of the first copolymer is 2000-10000, and the molecular weight of the second copolymer is 40000-100000; The weight ratio of the first copolymer to the second copolymer is 1:4-4:

1.

2. A method for preparing the wet and dry polymer pressure-sensitive adhesive according to claim 1, characterized in that: include: Mixing butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide, a free radical initiator and a first organic solvent to obtain a first precursor solution; The first precursor solution is subjected to a first polymerization reaction under an inert atmosphere, and then the product is mixed with a poor solvent and precipitated to obtain the first copolymer; the first polymerization reaction is a solution polymerization reaction; Mix butyl acrylate or isooctyl acrylate, benzyl acrylate, trimethylacryloyloxyethylammonium bistrifluoromethanesulfonimide, and a free radical initiator or add a second organic solvent to obtain a second precursor solution; The second precursor liquid is subjected to a second polymerization reaction under an inert atmosphere, and is mixed with a poor solvent and then precipitated, or the second copolymer is directly obtained; the second polymerization reaction is a bulk polymerization reaction or a solution polymerization reaction; The first copolymer and the second copolymer are mixed to obtain the dry and wet dual-purpose blended polymer pressure-sensitive adhesive.

3. The method for preparing the wet and dry polymer pressure-sensitive adhesive according to claim 2, characterized in that: The free radical initiator includes one or more of 2,2-azobisisobutyronitrile, benzoyl peroxide, Irgacure 184, Darocur 1173, 2,2-diethoxyacetophenone, and benzophenone.

4. The method for preparing the wet and dry polymer pressure-sensitive adhesive according to claim 2, characterized in that: The first organic solvent and the second organic solvent each independently include tetrahydrofuran and / or N,N-dimethylformamide.

5. The method for preparing the wet and dry polymer pressure-sensitive adhesive according to claim 2, characterized in that: The poor solvent includes one or more of n-hexane, petroleum ether and diethyl ether.

6. The method for preparing the wet and dry dual-purpose polymer blend pressure-sensitive adhesive according to any one of claims 2 to 5, characterized in that: The first polymerization reaction is carried out at 60-80° C. for 2-10 hours; the second polymerization reaction is carried out at 60-80° C. for 2-10 hours, or at room temperature under ultraviolet light for 1-5 hours.

7. A pressure-sensitive adhesive tape, characterized in that: The invention comprises a substrate and the dry and wet dual-purpose blended polymer pressure-sensitive adhesive according to claim 1 arranged on the surface of the substrate.

8. The pressure-sensitive adhesive tape according to claim 7, characterized in that: The dry and wet dual-purpose mixed polymer pressure-sensitive adhesive is dissolved in a third organic solvent before use, and then coated on the surface of the substrate.

9. The pressure-sensitive adhesive tape according to claim 8, characterized in that: The third organic solvent includes one or more of tetrahydrofuran, dichloromethane, chloroform and acetone.

10. The pressure-sensitive adhesive tape according to claim 8 or 9, characterized in that: The substrate includes any one of PET film, PE film, PI film, PVC film, fabric, and metal foil.

Images